(a) After a deregulated or transitioning company reduces the company’s rates under this subchapter, the company may not increase those rates above the applicable rates prescribed by this subchapter.
(b) If a transitioning company’s federal per minute of use switched access rates are reduced, the company shall reduce the company’s per minute of use switched access rates to not more than the applicable rates prescribed by this subchapter.

(c) Notwithstanding Subsections (a) and (b), a deregulated or transitioning company may decrease the company’s per minute of use switched access rates to amounts that are less than the applicable rates prescribed by this subchapter.